. >> to the world of sports now, as expected, former cycling star lance armstrong has admitted to doping during his professional career. by doing so, he has potentially open himself up to a stream of litigation that could hurt him financially for years to come. >> the biggest question is weather the u.s. government will reopen its investigation of the cyclists -- whether the u.s. government will reopen its investigation. >> the second half of the interview will be broadcast later today. here's more. >> oprah winfrey did not waste any time demanding a simple answer to questions that lance armstrong had spent years dodging. >> yes or no -- did you ever take banned substances to enhance your cycling performance? >> yes. >> yes or no -- in all seven of your tour de france victories, did you ever take let -- banned substances? >> yes. >> blood transfusions, testosterone, cortisone, human growth hormones -- lance armstrong admitted to using a range of methods and substances. he said he did not see himself as a cheat because it was part of cycling culture. >> i view the situation as one big lie